And how would I assemble a build like this? Is the heatsink of the laser to small? (You see it in the pictures on lazerer)

Help would be appreciated!

My budget is $75-$100 and that's why I'm askin, I don't have a lot of cash. (I have goggles from DinoDirect but I guess they don't work well - so please recommend me a pair of goggles too for each color, so while I'm buying I can buy for other colors to - the goggles are on another budget, not the laser budget!)

Well, for starters, it kind of depends on which batteries you plan on using before you pick a driver. I believe you can use an 18650 or 2x 16340s in this host. if you are going with the 18650 you'll need a boost driver wich will cost you around $25-$30. If you want to use 16340s (which will give you less run time) you could get away with using a linear driver. those are a lot cheaper, around $10 bucks.

You're also going to have to do something about the switch. Hopefully someone else can help you out with that.